The Eocene-oligocene preglacial-glacial transition in the atlantic sector of the Southern Ocean (ODP site 690)
High resolution interdisciplinary analyses of the clay and coarse (>40 μm) fractions of ODP Leg 113 Site 690 Eocene-Oligocene sediments on the flank of the Maud Rise, provide information on paleoproductivity, water masses, paleoclimate and erosion in the Antarctic range as well as on the cyclicit...
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1996
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ftoceanrep:oai:oceanrep.geomar.de:31209 2023-05-15T13:39:45+02:00 The Eocene-oligocene preglacial-glacial transition in the atlantic sector of the Southern Ocean (ODP site 690) Diester-Haass, Lieselotte Robert, C. Chamley, H. 1996 text https://oceanrep.geomar.de/id/eprint/31209/ https://oceanrep.geomar.de/id/eprint/31209/1/1-s2.0-0025322795001743-main.pdf https://doi.org/10.1016/0025-3227(95)00174-3 en eng Elsevier https://oceanrep.geomar.de/id/eprint/31209/1/1-s2.0-0025322795001743-main.pdf Diester-Haass, L., Robert, C. and Chamley, H. (1996) The Eocene-oligocene preglacial-glacial transition in the atlantic sector of the Southern Ocean (ODP site 690). Marine Geology, 131 (3-4). pp. 123-149. DOI 10.1016/0025-3227(95)00174-3 <https://doi.org/10.1016/0025-3227%2895%2900174-3>. doi:10.1016/0025-3227(95)00174-3 Article PeerReviewed 1996 ftoceanrep https://doi.org/10.1016/0025-3227(95)00174-3 2023-04-07T15:23:20Z High resolution interdisciplinary analyses of the clay and coarse (>40 μm) fractions of ODP Leg 113 Site 690 Eocene-Oligocene sediments on the flank of the Maud Rise, provide information on paleoproductivity, water masses, paleoclimate and erosion in the Antarctic range as well as on the cyclicity of these processes. Three time intervals are distinguished: 1. (1) The middle Eocene, characterized by (a) nearly pure smectites, (b) productivity varying between relatively high values in the 42–44 Ma interval to very low values after 42 Ma, and (c) cyclic variations which correspond to changes in clay mineral associations. A warm saline deep water mass is inferred to have protected carbonate shells against dissolution at Site 690. We interpret the abundant mica in the coarse fraction as distributed by intermediate currents. 2. (2) The latest middle Eocene-late Eocene, characterized by low productivity values increasing with time. Kaolinite and illite concentrations also increase. Since the middle/late Eocene boundary mixing in the water column, which starts during a cooling event, causes similar clay mineral assemblages at Site 690 and at Site 689 on top of Maud Rise. 3. (3) The Oligocene, separated from the Eocene by a hiatus, is characterized by high productivity, highly increased amounts of illite and other minerals originating from erosion and physical weathering of Antarctica, and by cyclic variations of clay mineral indices which appear to be synchronous with productivity variations with a 400–450 kyr cyclicity. Six periods of strong carbonate dissolution associated with low productivity levels are attributed to incursions of cold carbonate aggressive bottom water of a “Proto-AABW” type. Article in Journal/Newspaper Antarc* Antarctic Antarctica Southern Ocean OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Antarctic Maud Rise ENVELOPE(3.000,3.000,-66.000,-66.000) Southern Ocean The Antarctic Marine Geology 131 3-4 123 149 |
institution |
Open Polar |
collection |
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
op_collection_id |
ftoceanrep |
language |
English |
description |
High resolution interdisciplinary analyses of the clay and coarse (>40 μm) fractions of ODP Leg 113 Site 690 Eocene-Oligocene sediments on the flank of the Maud Rise, provide information on paleoproductivity, water masses, paleoclimate and erosion in the Antarctic range as well as on the cyclicity of these processes. Three time intervals are distinguished: 1. (1) The middle Eocene, characterized by (a) nearly pure smectites, (b) productivity varying between relatively high values in the 42–44 Ma interval to very low values after 42 Ma, and (c) cyclic variations which correspond to changes in clay mineral associations. A warm saline deep water mass is inferred to have protected carbonate shells against dissolution at Site 690. We interpret the abundant mica in the coarse fraction as distributed by intermediate currents. 2. (2) The latest middle Eocene-late Eocene, characterized by low productivity values increasing with time. Kaolinite and illite concentrations also increase. Since the middle/late Eocene boundary mixing in the water column, which starts during a cooling event, causes similar clay mineral assemblages at Site 690 and at Site 689 on top of Maud Rise. 3. (3) The Oligocene, separated from the Eocene by a hiatus, is characterized by high productivity, highly increased amounts of illite and other minerals originating from erosion and physical weathering of Antarctica, and by cyclic variations of clay mineral indices which appear to be synchronous with productivity variations with a 400–450 kyr cyclicity. Six periods of strong carbonate dissolution associated with low productivity levels are attributed to incursions of cold carbonate aggressive bottom water of a “Proto-AABW” type. |
format |
Article in Journal/Newspaper |
author |
Diester-Haass, Lieselotte Robert, C. Chamley, H. |
spellingShingle |
Diester-Haass, Lieselotte Robert, C. Chamley, H. The Eocene-oligocene preglacial-glacial transition in the atlantic sector of the Southern Ocean (ODP site 690) |
author_facet |
Diester-Haass, Lieselotte Robert, C. Chamley, H. |
author_sort |
Diester-Haass, Lieselotte |
title |
The Eocene-oligocene preglacial-glacial transition in the atlantic sector of the Southern Ocean (ODP site 690) |
title_short |
The Eocene-oligocene preglacial-glacial transition in the atlantic sector of the Southern Ocean (ODP site 690) |
title_full |
The Eocene-oligocene preglacial-glacial transition in the atlantic sector of the Southern Ocean (ODP site 690) |
title_fullStr |
The Eocene-oligocene preglacial-glacial transition in the atlantic sector of the Southern Ocean (ODP site 690) |
title_full_unstemmed |
The Eocene-oligocene preglacial-glacial transition in the atlantic sector of the Southern Ocean (ODP site 690) |
title_sort |
eocene-oligocene preglacial-glacial transition in the atlantic sector of the southern ocean (odp site 690) |
publisher |
Elsevier |
publishDate |
1996 |
url |
https://oceanrep.geomar.de/id/eprint/31209/ https://oceanrep.geomar.de/id/eprint/31209/1/1-s2.0-0025322795001743-main.pdf https://doi.org/10.1016/0025-3227(95)00174-3 |
long_lat |
ENVELOPE(3.000,3.000,-66.000,-66.000) |
geographic |
Antarctic Maud Rise Southern Ocean The Antarctic |
geographic_facet |
Antarctic Maud Rise Southern Ocean The Antarctic |
genre |
Antarc* Antarctic Antarctica Southern Ocean |
genre_facet |
Antarc* Antarctic Antarctica Southern Ocean |
op_relation |
https://oceanrep.geomar.de/id/eprint/31209/1/1-s2.0-0025322795001743-main.pdf Diester-Haass, L., Robert, C. and Chamley, H. (1996) The Eocene-oligocene preglacial-glacial transition in the atlantic sector of the Southern Ocean (ODP site 690). Marine Geology, 131 (3-4). pp. 123-149. DOI 10.1016/0025-3227(95)00174-3 <https://doi.org/10.1016/0025-3227%2895%2900174-3>. doi:10.1016/0025-3227(95)00174-3 |
op_doi |
https://doi.org/10.1016/0025-3227(95)00174-3 |
container_title |
Marine Geology |
container_volume |
131 |
container_issue |
3-4 |
container_start_page |
123 |
op_container_end_page |
149 |
_version_ |
1766122926346600448 |